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Buttstock Kit, Complete

  • 6997


This is a complete buttstock kit including the Buffer Tube, Buffer, standard Buffer Spring, Castle Nut, Recevier End Plate, and Tapco-like stock. Convert a fixed-stock AR-15 to an M4 configuration or complete your stripped lower on the cheap.

The stock is collapsible and 6-position to meet the needs of different-sized shooters in a variety of shooting positions. This is ready to install on any AR-15 lower so long as the Upper Receiver's buffer tube threads are in spec.

Take your pick of a Mil-Spec (1.15") or Commercial size (1.17") Buffer Tube and matching Butt stock.

Stock is made from a tough injection-molded plastic. The stock interior diameter closely matches the buffer tube for a tight fit. The stock adjustment lever/button has lots of stroke to fit other applications if needed. The buffer tube is anodized aluminum for a long service life. 

You get your choice of Buffer weight with this kit. If you don't know what to choose, most people start with a Standard 3oz. You can upgrade later if you feel you need more weight. Read more about our buffers here.

This kit is also available without the stock.

  • Available in either Mil-Spec or Commercial size
  • 6-position stock
  • Flat-back Buffer Tube
  • Buttstock has a bonus sling loop
  • 6061 T6 Aluminum 
  • Both options have the highly sought-after 'raised threads'
  • Weight varies, see table at the bottom of this page

You get:

  • Stock
  • Six-position buffer tube
  • Basic end plate
  • Standard buffer spring
  • Standard 3oz. buffer
  • Castle nut

    Compatible with:

    • Standard-spec AR-15/M16 lower receivers
    • Works with plastic, aluminum and other metal lowers

    Installation Difficulty:

    Tools required: Armourer's Wrench required for tightening the castle nut. We also recommend applying Aeroshell 33MS assembly grease to the Buffer Tube threads.

    Note: sometimes the castle nuts come from our supplier with rough threads, in which case we chase the threads with a bolt to smooth them out for you. It might look like the nut has been used but it's just our love marks.

    Total kit weight for each configuration:

    • Mil-Spec, with 3oz buffer - 469g
    • Mil-Spec, with H buffer - 489g
    • Mil-Spec, with H2 buffer - 519g
    • Mil-Spec, with H3 buffer - 544g
    • Commercial, with 3oz buffer - 509g
    • Commercial, with H buffer - 529g
    • Commercial, with H2 buffer - 559g
    • Commercial, with H3 buffer - 584g


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